New Studies Suggest Sea Levels Were 2-5 Meters Higher Than Today ~6000 Years Ago

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During the much-warmer-than-today Mid-Holocene, when CO2 concentrations lingered around 265 ppm, sea levels were multiple meters higher than they are now.

From about 5000 to 7000 years ago, when Earth was several degrees warmer than it is today, there was more water locked up on land as ice. Consequently, relative sea levels were much higher and land areas now well above sea level were submerged beneath the sea.

None of these paleo indicators suggest warmth, ice melt, or relative sea level are consistent with claims CO2 is a climate driver.

1. Hapsari et al., 2022

Image Source: Hapsari et al., 2022

2. Angulo et al., 2022

Image Source: Angulo et al., 2022

3. Watanabe Nara et al., 2022

“In the Middle Holocene (7000 years ago), there was a rapid rise in relative sea level (RSL) to the current sea level on the Japanese coast in response to melting Antarctic ice sheets (Nakada and Lambeck, 1987; Sakaguchi, 1983; Tanabe, 2020; Tanigawa et al., 2013). The RSL during the Middle and the Late Holocene reached an estimated maximum 2 m higher than the current sea level 4000 years ago during the Holocene high stand (HHS, Yokoyama et al., 2012), and morphological observations have confirmed this at Lake Ogawara during the Middle Holocene (Hirai, 1983). At that time, Lake Ogawara was the inner bay of the Pacific Ocean; however, in the late Holocene, as sea levels fell, Lake Ogawara became brackish (Hirai, 1983).”

4. Angulo et al., 2022

The reconstructions indicate Holocene paleo-sea levels between 3.1 m and 2.5 m above present one.”
“This study presents spatiotemporal paleo-sea-level reconstructions from Abrolhos archipelago and Abrolhos BANK AND fill in a coastline gap of 500 km where no precise paleo-sea level reconstruction exists. The reconstructions are based on sedimentary, biological and geomorphological EVIDENCE. The data indicates sea-levels up to 2.9 m higher than the current one between the Mid- to Late Holocene, in agreement with the empirical sea-level envelope and with predictions of geophysical sea-level models for the Brazilian coast.”

5. Angulo et al., 2022

“The new data indicate that sea level was higher at the Late-Holocene than it is at present and that the hydrodynamic factors overlap with sea-level changes, precluding more precise paleo-sea level reconstructions. According to previous works, the Rocas Atoll presents one of the most conspicuous paleo-sea level indicators, represented by reef remains.”
Image Source: Angulo et al., 2022

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By Kenneth Richard on 13. October 2022